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		<title>Document</title>
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	<body>
		<script>
			function Father(uname, age) {
				this.uname = uname;
				this.age = age;
			}
			Father.prototype.money = function () {
				console.log(25000);
			};

			function Son(uname, age, score) {
				Father.call(this, uname, age);
				this.score = score;
			}

			// Son.prototype = Father.prototype; 这样直接赋值会有问题，如果修改了子原型对象，父原型对象也会跟着变化
			Son.prototype = new Father();
			// 如果利用对象的形式修改了原型对象，别忘了利用 constructor 指回原来的构造函数
			son.prototype.constructor = Son;
			// 这个是子构造函数专有的方法
			Son.prototype.exam = function () {
				console.log('examination');
			};

			let son = new Son('vae', 35, 100);

			console.log(son);
			console.log(Father.prototype);
			console.log(Son.prototype.constructor);
		</script>
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